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Equity Method Investments in Affiliates - Change in Equity Method Investments (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Change in Equity Method Investments in Affiliates [Roll Forward]    
Balance, as of December 31, 2017 $ 3,304.7  
Distributions of earnings from equity method investments (410.3) $ (368.0)
Balance, as of September 30, 2018 3,055.3  
Equity Method Investee    
Change in Equity Method Investments in Affiliates [Roll Forward]    
Balance, as of December 31, 2017 3,304.7  
Equity method earnings 300.3  
Equity method intangible amortization and impairments (109.0)  
Distributions of earnings from equity method investments (410.3)  
Foreign currency translation (21.3)  
Other (9.1)  
Balance, as of September 30, 2018 $ 3,055.3